Sorrell said cuts to Corporation Tax and a review on the tax of overseas profits may well convince WPP to return from Dublin, where the company has had its tax domicile since 2008. His endorsement will give entrepreneurs the clearest picture yet that their Budget has opened Britain for business.
Sorrell began building WPP back in the 1980s. He masterminded two multimillion pound agency takeovers of J. Walter Thompson (£566m) and Ogilvy and Mather (£825) in 1987 and 1989 respectively.
Sorrell was one of a few entrepreneurs to take business elsewhere. Matthew Emmens and Angus Russell took pharmaceutical company Shire Plc to Dublin in 2008 to avoid Britain's strenuous tax laws. Only last year, Wolseley, the FTSE 100 plumbing and heating group, unveiled plans to relocate to Switzerland to avoid the Coalition's taxes. Could these companies follow WPP and plan a return to these shores?
Sorrell's comments are a vindication of the pro-growth Budget. Essentially, you can't kid a kidder. No amount of PR puff from Osborne would con the UK's most illustrious advertising tycoon into coming back to Blighty if it wasn't worth it. Sorrell was ambassador for business in the 90s and closeted in with Osborne a week or so ago. He might even have had a sneak preview of the Chancellor's measures and decided they made the environment here rosy enough to consider a return.
After all, the cut in Corporation Tax from 28% to 23% in four year's time will give the UK the lowest level of tax of the G7 countries.
Mitesh Soma, founder of Chemist Direct has echoed Sorrell's vote of confidence and he hopes the Corporation Tax cut encourages more start-ups: "In these difficult times it's great to see the government introducing measures to promote green shoots of growth. I hope cutting corporation tax by 2% will encourage more people to take the plunge to start new businesses.
"The Chancellor was right to identify enterprise and entrepreneurialism as the antidote to our sluggish economy. We need to do all we can to stimulate small business, and this is a step in the right direction."
All the vital information on this year's Budget has been extensively covered by Smarta, so if you missed any of yesterday's announcements you can catch up with our round up of key points, as well as more reactions from businesses owners and entrepreneurs.